On 12/07/2013 02:58 AM, Michael Hunger wrote:
> Let's move this whole discussion to the google group :)
>
> Map support for properties is planned and almost made it into the
> product some time ago but then were some considerations so that it
> sadly didn't work out.
>
> User defined functions would be a way to go but much better with real
> support by the storage engine and language.
>
> Wes, didn't you want to look into a UDF PoC?
Here is a very specific and real use case for such a user defined
function (or map capability) for JSON:
I have a discovery item in JSON which collects ulimit values and looks
like this:
{
"discovertype": "ulimit",
"description": "ulimit values for root",
"host": "servidor",
"source": "/usr/share/assimilation/discovery_agents/ulimit",
"data": {
"hard":
{"c":null,"d":null,"f":null,"l":64,"m":null,*"n":1024*,"p":47013,"s":null,"t":null,"v":null},
"soft":
{"c":0,"d":null,"f":null,"l":64,"m":null,*"n":1024*,"p":47013,"s":8192,"t":null,"v":null}
}
}
This is the results of the ulimit discovery module. I used the JSON
value null to represent the ulimit value unlimited.
One of those flags (-*n*) is the maximum number of open files. As you
can see, this example is out of compliance with Neo4j best practices ;-).
This is in a field called JSON_ulimit.
So, if I wanted to see if a machine had enough open files to follow
neo4j best practices, I would like to check */JSON_ulimit.data.soft.n/*
and see if it was greater or equal to 50000 (or null) on every machine
running neo4j.
As it is now, I can't do this in Cypher. I have to do it in python (or
Java, or...)
I'd love to have a way to do this in Cypher.
*Michael: *Could I represent this data and perform this query with the
proposed map capability?
*Wes:* Could you make such a query work with a user-defined function?
Don't you want me to be able to tell your customers they're not in
compliance with Neo4j best practices? :-D
--
Alan Robertson <[email protected]> - @OSSAlanR
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
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